Paragon X-ray pointers : a complete textbook on radiography with Paragon X-ray plates
A 1915 trade manual on radiography issued in Chicago by George W. Brady & Co. to sell Paragon x-ray plates to physicians and technicians. Wiring diagrams drawn in heavy line with hand-lettered labels for rheostats, rectifying switches and synchronous motors sit alongside grainy halftone radiographs of skulls, abdomens and bones, useful for circuit schematics and soft grey tonal plates.
